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Quick answer：Building safety warning signs typically use colors such as red, yellow, and black to convey messages. Red is used to indicate danger or prohibition, yellow for caution, and black for the text and symbols that describe the warning.
Quick answer：Building safety warning signs typically use colors such as red, yellow, and black to convey messages. Red is used to indicate danger or prohibition, yellow for caution, and black for the text and symbols that describe the warning.